fix non-360 MSVC builds and add generic DEBUG handling for msvc and non-msvc

Makefile.libretro

@@ -422,16 +422,17 @@ LDFLAGS += -DLL
 else ifeq ($(platform), xbox360_msvc2010)
 TARGET := $(TARGET_NAME)_libretro_xdk360.lib
 MSVCBINDIRPREFIX = $(XEDK)/bin/win32
-CC  = "$(MSVCBINDIRPREFIX)/cl.exe"
+CC  = cl.exe
-CXX = "$(MSVCBINDIRPREFIX)/cl.exe"
+CXX = cl.exe
 
+PATH := $(shell IFS=$$'\n'; cygpath "$(MSVCBINDIRPREFIX)"):$(PATH)
 INCLUDE := $(shell IFS=$$'\n'; cygpath "$(VS100COMNTOOLS)../../VC/include")
 
 export INCLUDE := $(INCLUDE)
 export LIB := $(XEDK)/lib/xbox
 PSS_STYLE :=2
-CFLAGS   += -D_XBOX -D_XBOX360 -MT
+CFLAGS   += -D_XBOX -D_XBOX360
-CXXFLAGS += -D_XBOX -D_XBOX360 -MT
+CXXFLAGS += -D_XBOX -D_XBOX360
 STATIC_LINKING=1
 # Windows MSVC 2005 x86
 else ifeq ($(platform), windows_msvc2005_x86)
@@ -480,9 +481,37 @@ else
 endif
 
 ifeq ($(DEBUG), 1)
+	ifneq (,$(findstring msvc,$(platform)))
+		ifeq ($(STATIC_LINKING),1)
+			CFLAGS += -MTd
+			CXXFLAGS += -MTd
+		else
+			CFLAGS += -MDd
+			CXXFLAGS += -MDd
+		endif
+
+		CFLAGS += -Od -Zi -DDEBUG -D_DEBUG
+		CXXFLAGS += -Od -Zi -DDEBUG -D_DEBUG
+	else
 		CFLAGS += -O0 -g -DDEBUG
+		CXXFLAGS += -O0 -g -DDEBUG
+	endif
+else
+	ifneq (,$(findstring msvc,$(platform)))
+		ifeq ($(STATIC_LINKING),1)
+			CFLAGS += -MT
+			CXXFLAGS += -MT
+		else
+			CFLAGS += -MD
+			CXXFLAGS += -MD
+		endif
+
+		CFLAGS += -O2 -DNDEBUG
+		CXXFLAGS += -O2 -DNDEBUG
 	else
 		CFLAGS += -O2 -DNDEBUG
+		CXXFLAGS += -O2 -DNDEBUG
+	endif
 endif
 
 ifeq ($(EXTERNAL_ZLIB), 1)
@@ -524,10 +553,10 @@ ifneq (,$(findstring msvc,$(platform)))
 	OBJOUT = -Fo
 	LINKOUT = -out:
 ifeq ($(STATIC_LINKING),1)
-	LD = "$(MSVCBINDIRPREFIX)/lib.exe"
+	LD = lib.exe
 	STATIC_LINKING=0
 else
-	LD = "$(MSVCBINDIRPREFIX)/link.exe"
+	LD = link.exe
 endif
 else
 	OBJOUT   = -o